<div class="mst">
  <div nz-row class="grid-demo">
    <div nz-col nzSpan="12">col-12</div>
    <div nz-col nzSpan="12">col-12</div>
  </div>

  <div nz-row class="grid-demo">
    <div nz-col nzSpan="8">col-8</div>
    <div nz-col nzSpan="8">col-8</div>
    <div nz-col nzSpan="8">col-8</div>
  </div>

  <div nz-row class="grid-demo">
    <div nz-col nzSpan="6">col-6</div>
    <div nz-col nzSpan="6">col-6</div>
    <div nz-col nzSpan="6">col-6</div>
    <div nz-col nzSpan="6">col-6</div>
  </div>
</div>
